/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2005, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program is free software; you can redistribute it and/or modify
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
* Known contributors to this file:
* Dave Pare, 1989
* Steve McClure, 2000
- * Markus Armbruster, 2005
+ * Markus Armbruster, 2005-2006
*/
#include <config.h>
#include <errno.h>
#include <fcntl.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <string.h>
-#if !defined(_WIN32)
+#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
-#endif
-#include "common.h"
#include "file.h"
-#include "gen.h"
#include "match.h"
#include "misc.h"
#include "nsc.h"
-#include "optlist.h"
+#include "prototypes.h"
static int fillcache(struct empfile *, int);
static int do_write(struct empfile *, void *, int, int);
ef_open(int type, int how)
{
struct empfile *ep;
+ struct flock lock;
int oflags, fd, fsiz, size;
if (ef_check(type) < 0)
#if defined(_WIN32)
oflags |= O_BINARY;
#endif
- if ((fd = open(ep->file, oflags, 0660)) < 0) {
+ if ((fd = open(ep->file, oflags, S_IRWUG)) < 0) {
logerror("Can't open %s (%s)", ep->file, strerror(errno));
return 0;
}
+ lock.l_type = how & EFF_RDONLY ? F_RDLCK : F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = lock.l_len = 0;
+ if (fcntl(fd, F_SETLK, &lock) == -1) {
+ logerror("Can't lock %s (%s)", ep->file, strerror(errno));
+ close(fd);
+ return 0;
+ }
+
/* get file size */
fsiz = fsize(fd);
if (fsiz % ep->size) {
/* allocate cache */
if (ep->flags & EFF_STATIC) {
- /* ep->cache already points to space for e->csize elements */
+ /* ep->cache already points to space for ep->csize elements */
if (how & EFF_MEM) {
if (ep->fids > ep->csize) {
logerror("Can't open %s: file larger than %d bytes",
if (how & EFF_MEM)
ep->csize = ep->fids;
else
- ep->csize = max(1, blksize(fd) / ep->size);
+ ep->csize = blksize(fd) / ep->size;
+ /* 0 could lead to null cache, which confuses assertions */
+ if (!ep->csize)
+ ep->csize++;
size = ep->csize * ep->size;
if (CANT_HAPPEN(ep->cache))
free(ep->cache);
ep->cache = malloc(size);
- if (ep->cache == NULL && size) {
+ if (ep->cache == NULL) {
logerror("Can't open %s: out of memory", ep->file);
close(fd);
return 0;
}
}
- /*
- * Could close fd if both EFF_RDONLY and EFF_MEM, but that doesn't
- * happen, so don't bother.
- */
-
return 1;
}
ef_extend(int type, int count)
{
struct empfile *ep;
- char *tmpobj;
+ void *tmpobj;
int id, i, how;
if (ef_check(type) < 0)
}
return 1;
}
-
-static void
-ef_fix_size(struct empfile *ep, int n)
-{
- ep->cids = ep->fids = n;
- ep->csize = n + 1;
-}
-
-static void
-ef_init_chr(int type, size_t size, ptrdiff_t name_offs)
-{
- struct empfile *ep = &empfile[type];
- char *p;
-
- for (p = ep->cache; *((char **)(p + name_offs)); p += size) ;
- ep->cids = ep->fids = (p - ep->cache) / size;
-}
-
-/*
- * Initialize Empire tables.
- * Must be called once, before using anything else from this module.
- */
-void
-ef_init(void)
-{
- struct castr *ca;
- struct empfile *ep;
- struct symbol *lup;
- int i;
-
- empfile[EF_MAP].size = empfile[EF_BMAP].size = (WORLD_X * WORLD_Y) / 2;
-
- ef_init_chr(EF_SHIP_CHR,
- sizeof(struct mchrstr), offsetof(struct mchrstr, m_name));
- ef_init_chr(EF_PLANE_CHR,
- sizeof(struct plchrstr), offsetof(struct plchrstr, pl_name));
- ef_init_chr(EF_LAND_CHR,
- sizeof(struct lchrstr), offsetof(struct lchrstr, l_name));
- ef_init_chr(EF_NUKE_CHR,
- sizeof(struct nchrstr), offsetof(struct nchrstr, n_name));
-
- ca = (struct castr *)empfile[EF_META].cache;
- for (i = 0; ca[i].ca_name; i++) ;
- ef_fix_size(&empfile[EF_META], i);
-
- for (ep = empfile; ep->uid >= 0; ep++) {
- if (ep->cadef == symbol_ca) {
- lup = (struct symbol *)ep->cache;
- for (i = 0; lup[i].name; i++) ;
- ef_fix_size(ep, i);
- }
- }
-}